Abstract: A method of determining the flow rate of a viscous fluid stream comprises passing the fluid stream through a field of view of an electronic imaging device, which produces output signals representing images of the fluid stream at successive times t.sub.0, t.sub.1, . . . t.sub.n. Signals representing an image of the fluid stream at a first time t.sub.i are stored in a first memory, while signals representing an image of the fluid stream at a second time t.sub.j, are stored in a second memory. The time t.sub.j -t.sub.i is less than the time taken for a point on the fluid stream to cross the field of view of the imaging device. The stored signals are then analyzed to derive width signals W(y) representing the width of the fluid stream as a function of y, where y represents a coordinate in the direction of fluid flow, and the first and second stored signals are compared to identify a common point on the fluid stream in the respective images represented thereby.

Abstract: A machine and process is provided for sinuously folding a batt of bulky non-woven fibrous material such as glass fiber and inserting the folded batt into a container such as a bag. The machine has a support table having first and second sections separated by an intermediate section, and the intermediate section has a first series of stationary, transversely extending rotatable rollers arranged along it, and a second series of movable, transversely extending rotatable rollers supported by vertically movable mountings which allow the movable rollers to be moved from an initial raised position, in which they are raised above and separated by a gap from the stationary rollers, to a lowered position in which they are below the stationary rollers so that the stationary and movable rollers are over-lapped.